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firebase - Can't get Firestore Rules get() to work inside a function

Firestore doesn't work well with get inside a function

I have this rule

service cloud.firestore {
  match /databases/{database}/documents {

    function isProjectOpenForAssign() {
      return get(/databases/$(database)/documents/projects/$(anyProject)).data.canAssignTask == true;
    }

    match /projects/{anyProject} {
      allow create: if request.auth != null;

      match /tasks/{anyTask} {
        allow create: if request.auth != null && (isProjectOpenForAssign());
      }
    }
  }
}

When running the simulator testing it I get:

Error running simulation — Error: simulator.rules line [23], column [14]. Function not found error: Name: [get].; Error: Invalid argument provided to call. Function: [get], Argument: ["||invalid_argument||"]

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